Square Feet to Cubic Yards Calculator

Square feet measure area, while cubic yards measure volume, so an area cannot be converted to volume without a material depth. This calculator multiplies the entered square feet by depth converted from inches to feet, producing cubic feet. It then divides by 27 because one cubic yard contains 27 cubic feet. An optional percentage is applied afterward to provide an adjusted ordering quantity for waste, compaction, settlement, grading variation, or handling loss. The calculation is useful for concrete slabs, gravel drives, mulch beds, topsoil, sand, base course, and other materials spread at a reasonably uniform thickness. Measure the plan area as accurately as practical. Rectangles use length times width, while irregular projects can be divided into smaller shapes and added together. Use the average compacted or finished depth required by the design. If the site has substantial grade changes, calculate separate zones or use survey information rather than relying on one depth for the entire area. The volume result does not directly determine weight or bag count. Bulk density varies widely between dry and wet soil, angular and rounded aggregate, loose and compacted material, and different concrete mixes. Ask the supplier for density, coverage, compaction factor, minimum delivery, and available order increments. Concrete orders commonly include a modest contingency for subgrade variation and spillage. Landscape materials may settle significantly after placement, while aggregate base may be specified by compacted thickness and therefore require more loose material. Choose the allowance based on project conditions instead of automatically using a large percentage. A well-formed slab on a verified base may need less extra material than rough excavation. Conversely, an uneven trench or deep landscape bed may justify more. The adjusted result is simply the base volume multiplied by one plus the entered percentage; it does not model a specific compaction ratio. Before ordering, confirm that all dimensions use the units shown and that depth represents inches, not feet. Review drawings for thickened edges, footings, voids, slopes, and embedded objects that alter volume. For structural concrete, follow approved plans and coordinate the pour size with the producer. With a verified area, realistic depth, and project-specific allowance, this conversion gives a clear starting quantity for comparing prices and scheduling deliveries.